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You are planning to deploy a Python application to an autoscaled managed instance group on Compute Engine using GCP Deployment Manager. What is the most efficient method to deploy the application onto the instances without adding unnecessary complexity?
A
Once the instance starts up, manually connect over SSH and install the application.
B
Include a startup script to bootstrap the Python application when creating an instance template by running gcloud compute instance-templates create app-template --metadata-from-file startup-script=/scripts/install_app.sh._
C
Include a startup script to bootstrap the Python application when creating an instance template by running gcloud compute instance-templates create app-template --metadata-from-file startup-script-url=/scripts/install_app.sh._
D
Include a startup script to bootstrap the Python application when creating an instance template by running gcloud compute instance-templates create app-template --startup-script=/scripts/install_app.sh._